Documentation: Add coreboot release 26.03 template

This adds the release notes template for the upcoming March 2026
release of coreboot.

Change-Id: I7702ee6b5dffce067503ff6e4ccb6508d30bf48f
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/90498
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Alicja Michalska <ahplka19@gmail.com>

Documentation/releases/coreboot-26.03-relnotes.md

@@ -0,0 +1,97 @@
+Upcoming release - coreboot 26.03
+========================================================================
+
+The 26.03 release is scheduled for the end of March, 2026
+
+
+Update this document with changes that should be in the release notes.
+
+* Please use Markdown.
+* See the past few release notes for the general format.
+* The chip and board additions and removals will be updated right
+  before the release, so those do not need to be added.
+* Note that all changes before the release are done are marked upcoming.
+  A final version of the notes are done after the release.
+
+
+
+Significant or interesting changes
+----------------------------------
+
+* Add changes that need a full description here
+
+* This section should have full descriptions and can or should have
+  a link to the referenced commits.
+
+
+
+Additional coreboot changes
+---------------------------
+
+The following are changes across a number of patches, or changes worth
+noting, but not needing a full description.
+
+* Changes that only need a line or two of description go here.
+
+
+
+Changes to external resources
+-----------------------------
+
+### Toolchain updates
+
+
+
+### Git submodule pointers
+
+
+### External payloads
+
+
+
+Platform Updates
+----------------
+
+### Added mainboards:
+* To be filled in immediately before the release by the release team
+
+
+### Removed Mainboards
+* To be filled in immediately before the release by the release team
+
+
+### Updated SoCs
+* To be filled in immediately before the release by the release team
+
+
+
+Plans to move platform support to a branch
+------------------------------------------
+* To be filled in immediately before the release by the release team
+
+
+
+Statistics from the 25.12 to the 26.03 release
+--------------------------------------------
+* To be filled in immediately before the release by the release team
+
+
+
+Significant Known and Open Issues
+---------------------------------
+
+Issues from the coreboot bugtracker: <https://ticket.coreboot.org/>
+* To be filled in immediately before the release by the release team
+
+
+
+coreboot Links and Contact Information
+--------------------------------------
+
+* Main Web site: <https://www.coreboot.org>
+* Downloads: <https://coreboot.org/downloads.html>
+* Source control: <https://review.coreboot.org>
+* Documentation: <https://doc.coreboot.org>
+* Issue tracker: <https://ticket.coreboot.org/projects/coreboot>
+* Donations: <https://coreboot.org/donate.html>
+

Documentation/releases/index.md

@@ -6,7 +6,7 @@ Please add to the release notes as changes are added:
 ```{toctree}
 :maxdepth: 1
 
-25.12  - December 2025 <coreboot-25.12-relnotes.md>
+26.03  - March 2026 <coreboot-26.03-relnotes.md>
 ```
 
 The [checklist] contains instructions to ensure that a release covers all
@@ -22,6 +22,7 @@ important is taken care of.
 ```{toctree}
 :maxdepth: 1
 
+25.12  - December 2025 <coreboot-25.12-relnotes.md>
 25.09  - September 2025 <coreboot-25.09-relnotes.md>
 25.06  - June 2025 <coreboot-25.06-relnotes.md>
 25.03  - March 2025 <coreboot-25.03-relnotes.md>